CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common stock	Paid-in capital	Treasury stock	Accumulated other comprehensive loss	Retained earnings	ASU 2016-09 Paid-in capital	ASU 2016-09 Retained earnings	ASU 2016-01 Accumulated other comprehensive loss	ASU 2016-01 Retained earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of accounting standard update							$ 49	$ 153
Balance, beginning of year at Dec. 31, 2016		$ 359,400	$ 1,782,337	$ (150,359)	$ (75,100)	$ 632,564
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock		10,386	60,903
Net common stock issued under share-based compensation plans		781	(7,602)
Equity compensation			14,895
Purchases of common stock				0
Reissuance of treasury stock, net				150,359		(21,740)
Other comprehensive income (loss)	$ 41,739				41,739
Net income	355,761					355,761
Cumulative effect to reclassify certain tax effects from accumulated other comprehensive loss	(10,422)				(10,422)	10,422
Balance, end of year at Dec. 31, 2017	3,154,526	370,567	1,850,582	0	(43,783)	977,160
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of accounting standard update					(18)				$ (18)	$ 18
Net common stock issued under share-based compensation plans		786	(8,917)
Equity compensation			20,871
Purchases of common stock				(175,059)
Other comprehensive income (loss)	(80,413)				(80,413)
Net income	670,097					670,097
Balance, end of year at Dec. 31, 2018	3,581,891	371,353	1,862,536	(175,059)	(124,214)	1,647,275
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Reissuance of treasury stock, net under share-based compensation plans			(11,715)	5,989
Equity compensation			18,898
Purchases of common stock				(114,126)
Other comprehensive income (loss)	196,922				196,922
Net income	673,763					673,763
Cash dividends						(42,388)
Balance, end of year at Dec. 31, 2019	$ 4,309,234	$ 371,353	$ 1,869,719	$ (283,196)	$ 72,708	$ 2,278,650